MIPS64: Fix bugs after hole-nan value change.

MIPS64: Fix bugs after hole-nan value change.

TEST=mjsunit/regress/regress-undefined-nan{2,3}, mjsunit/elements-transition, mjsunit/elide-double-hole-check-*
BUG=

Committed: https://crrev.com/1ea1141c81caf3f33d72f2f7f07c6d1719ef7d51
Cr-Commit-Position: refs/heads/master@{#26374}

[paul.l..., 2015-02-01 21:57:05]

paul.lind@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, balazs.kilvady@imgtec.com, danno@chromium.org,
dusan.milosavljevic@imgtec.com

[paul.l..., 2015-02-01 21:57:06]

PTAL, this resolves all the issues on the sim builds.

[akos.palfi.imgtec, 2015-02-01 23:35:28]

LGTM.

[paul.l..., 2015-02-01 23:36:23]

The CQ bit was checked by paul.lind@imgtec.com

[commit-bot: I haz the power, 2015-02-01 23:37:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/892853002/1

[commit-bot: I haz the power, 2015-02-02 00:00:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-02 00:00:37]

Patchset 1 (id:??) landed as
https://crrev.com/1ea1141c81caf3f33d72f2f7f07c6d1719ef7d51
Cr-Commit-Position: refs/heads/master@{#26374}